#include<stdio.h>
#include<unistd.h>

int main()
{
    pid_t id = fork();
    if(id< 0)
    {
        perror("fork");
        return 1;

    }
    else if(id == 0)
    {
        while(1)
        {
            printf("i am child , pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }
    }
    else 
    {

        while(1)
        {
            printf("i am parent, pid:%d, ppid:%d\n",getpid(),getppid());
            sleep(1);
        }
    }



    return 0;
}
